msgr: always start reaper
msgr: always start reaper

If we didn't explicitly bind (i.e. are a client), then we don't start
the accepter.  That's fine. But the reaper thread start was also
conditional, when it shouldn't be; otherwise the client can't clean up
old Pipes (and their sockets).

Fixes: #732
Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@newdream.net>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph